原文链接https://www.cnblogs.com/zhouzhendong/p/ARC101D.html 题目传送门 - ARC101D 题意 给定一个序列 A . 定义一个序列 A 的中位数为:给 A 排序,得到的第 $\left\lfloor\cfrac{i}{2}\right\rfloor+1$ 项的值. 序列 B 由序列 A 的所有连续子序列的中位数构成. 问序列 B 的中位数是多少. 序列中可能出现重复的数,$|A| \leq 10^5$ . 题解 注意这里说的“中位数”是题意里
结论:每次把字符丢到最外面最优,用树状数组统计答案,把字符放到最外边后可以当成消失了,直接在树状数组上删掉就好. 感性理解是把字符丢到中间会增加其他字符的移动次数,但是丢到外面不会,所以是正确的. #include<iostream> #include<cstring> #include<cstdlib> #include<cstdio> #define ll long long using namespace std; ; int n, x, num; ]
You are given an integer sequence of length N, a= {a1,a2,…,aN}, and an integer K. a has N(N+1)⁄2 non-empty contiguous subsequences, {al,al+1,…,ar} (1≤l≤r≤N). Among them, how many have an arithmetic mean that is greater than or equal to K? Constraints
题目链接: C. Subsequences time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output For the given sequence with n different elements find the number of increasing subsequences with k + 1 elements. It is
E. e-Government time limit per test:1 second memory limit per test:256 megabytes input:standard input output:standard output The best programmers of Embezzland compete to develop a part of the project called "e-Government" — the system of automa
题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=2227 Find the nondecreasing subsequences Time Limit: 10000/5000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)
题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=1394 Minimum Inversion Number Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 10